Spliting file content into ArrayList

Question

I have a file where I get to read it's content. Now I would like to split each seperate line into an arrayList individually and cant succeed.

This is what I have so far

try {
        input = new FileInputStream(test);


        byte testContent[] = new byte[(int) test.length()];
        input.read(testContent);


        String testFile = new String(testContent);
        System.out.println(testFile);

    }

An example of file content is as follows,

0,0,5,13,9,1,0,0,0,0,13,15,10,15,5,0,0,3,15,2,0,11,8,0,0,4,12,0,0,8,8,0,0,5,8,0 0,0,0,12,13,5,0,0,0,0,0,11,16,9,0,0,0,0,3,15,16,6,0,0,0,7,15,16,16,2,0,0,0,0,1,1 0,0,0,4,15,12,0,0,0,0,3,16,15,14,0,0,0,0,8,13,8,16,0,0,0,0,1,6,15,11,0,0,0,1,8,1 0,0,7,15,13,1,0,0,0,8,13,6,15,4,0,0,0,2,1,13,13,0,0,0,0,0,2,15,11,1,0,0,0,0,0,1 0,0,0,1,11,0,0,0,0,0,0,7,8,0,0,0,0,0,1,13,6,2,2,0,0,0,7,15,0,9,8,0,0,5,16,10,0,1

I would like the above to be in arrays like

[0,0,5,13,9,1,0,0,0,0,13,15,10,15,5,0,0,3,15,2,0,11,8,0,0,4,12,0,0,8,8,0,0,5,8,0] [0,0,0,12,13,5,0,0,0,0,0,11,16,9,0,0,0,0,3,15,16,6,0,0,0,7,15,16,16,2,0,0,0,0,1,1] [0,0,0,4,15,12,0,0,0,0,3,16,15,14,0,0,0,0,8,13,8,16,0,0,0,0,1,6,15,11,0,0,0,1,8,1] [0,0,7,15,13,1,0,0,0,8,13,6,15,4,0,0,0,2,1,13,13,0,0,0,0,0,2,15,11,1,0,0,0,0,0,1] [0,0,0,1,11,0,0,0,0,0,0,7,8,0,0,0,0,0,1,13,6,2,2,0,0,0,7,15,0,9,8,0,0,5,16,10,0,1]

Thanks in advance for any help

Use a `BufferedReader` to read it line-by-line; split the individual lines using `String.split`. — Andy Turner, Feb 05 '16 at 08:15
You could arguably use Scanner, but I think the most efficient thing here is to read the whole line then split as @AndyTurner suggested. — Neil, Feb 05 '16 at 08:23
I tagged artificial intelligence just as it is part of a course work involving AI...those numbers are an example for a handwriting recognition to be used with various AI algorithms — ep83, Feb 05 '16 at 11:08

shmosel · Answer 1 · 2016-02-05T08:30:08.647

1

How about Files.readAllLines():

List<String> lines = Files.readAllLines(new File(test).toPath());

If you're using Java 7, you'll need this version:

List<String> lines = Files.readAllLines(new File(test).toPath(), StandardCharsets.UTF_8);

edited Feb 05 '16 at 08:30

answered Feb 05 '16 at 08:24

shmosel

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score 0 · Answer 2 · edited May 23 '17 at 10:28

0

Use String#split()

String[] strings= testFile.split("\\r?\\n"); 
List<String> list = Arrays.asList(strings);

You can have more details about this method from this question How to split a string in Java

edited May 23 '17 at 10:28

Community

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answered Feb 05 '16 at 08:16

awsome

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score 0 · Answer 3 · answered Feb 05 '16 at 08:22

0

String [] lines = testFile.split("\\r?\\n");

answered Feb 05 '16 at 08:22

Helios

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score 0 · Answer 4 · answered Feb 05 '16 at 08:33

You can try something like this:

BufferedReader br = new BufferedReader(new FileReader(yourFile));
List<String[]> listOfArrays = new ArrayList<String[]>();

String nextLine;
while((nextLine = br.readLine()) != null){

    String[] lineArray = nextLine.split(",");
    listOfArrays.add(lineArray);

}

Spliting file content into ArrayList

4 Answers4